Looks like a good alternative yes.
Still managed, but all the 48 port ones seem to be managed just the more expensive ones have more features which would probably be irrelevant to you!
They do a Netgear

Looks ok to me but you might want to bear in mind that the SLM248P-G5 is a managed switch which has extra functions and also 2 special ports designed for uplinks (connections to other switches).
I believe you can probably use these as normal ports though, which would mean you could literally replace it like for like with the other one.
It would however be cheaper to use a non-managed switch unless you plan on monitoring and controlling who has access to certain resources / traffic etc.

We use Dlink switches which are cheaper and do the job, but depends on the money available as Linksys are probably better.
You could pick one up for around £200 for a low end model.

The one you chose has 2 extra "uplink" ports so you do have 48 normal ports as well which is good.
If you wanted you could link the old switch together via this port and have 72 total ports! (might be a bit over the top for now but useful in the future).

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